Here's my thoughts;
Your graphics were amazing! They are definitely the highlight of the game! The animations were clean and the particles also helped add to the wonderful atmosphere! I think it would be nice if there was a bit more variation (different trees and rocks instead of the same ones repeated everywhere), but considering the time frame of the jam, it doesn’t really matter.
In regards to the theme, it was spot on since it felt like I was acting out a legend, and most of the time I was definitely lost!
The sound design was very nice, but it did get a bit repetitive considering how long I was wondering around for. Also, the sound didn't come through my laptop’s speakers, so at first, I thought there wasn't any until I plugged headphones into the controller. But otherwise the sounds were very good, and especially the hammer sounded like it had a lot of weight to it. Now for gameplay. Although I understand you want players to try and figure it out on their own, I think there should definitely be some sort of tutorial. I never did find the use for the hammer, attack or the spear and I found the axe very hard to use at first. I sort of got used to using the axe, but I often got stuck I a ditch that I couldn't get out of and had to restart the game. I think I was supposed to be able to perform double jumps (first troughing onto one wall and then the other while still in the air), but I never managed to, so I'm not sure.
It's a pity, since I really like the idea of the mechanic, just I found it very hard to use, so I mostly went down and as a result didn't get to finish the game. I was using a ps4 controller, and jump didn't work for some reason, which would probably help a lot.
There were also a lot of glitches: getting stuck on the spot, getting stuck in slow motion, falling through the floor and not being able to through the axe just to name a few.
It's not that I don't like the game, I think it has great potential! I just think there is space for a lot of improvement. I hope you keep working on the game, as I would like to carry on exploring the amazing environment!